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I've heard several different things about TPG grading.
A lot of the grade itself is done with eyes only.
They use 4 or 7 power routinely and for certain varieties like 22 plains it must not show with 10X.
Your 69-D probably shows up the best under low magnification but might not show as well with none or with high magnification but I have a feeling they'll see the G. :)
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Oh G :LOL_Hair: Poor pun :LOL_Hair: Since it is partially visible on the full coin and really lite on the close up I would think the grader would see it... Don't know if the partial FGs are identified by the TPGs... Different light wave lengths coupled with intensity and angle can make normally invisible details visible but I wouldn't think the TPGs would do the forensics except on high value coins???